Locking device for incandescent lamps



.L- M. TOPOOSIAN.

LOCKING DEVICE FOR INCANDESCENT LAMPS APPLICATION FILED Aue.9. 1919.

1,391,868. PatenteflSept. 27,1921.

A TTORNEY.

LEON M. TOPOOSIAN, OF SPRINGFIELD, MASSACHUSETTS.

LOCKING DEVICE FOR INCANDESCENT LAMPS.

Specification of Letters Patent.

Patented Sept. 27, 1921.

Application filed August 9, 1919. Serial No. 316,506.

To all whom it may concern:

Be it known that I, LEON M. TOPOOSIAN, of Springfield, county of Hampden, and Commonwealth of Massachusetts, a citizen of the United States of America, have invented certain new and useful Improvements in a Locking Device for Incandescent Lamps, of which the following is a specification.

This invention relates to improvements in sockets for holding incandescent lamps.

The object of the invention is to provide a device for preventing the removal of the lamp or bulb from its socket by unauthorized persons. I11 shops, factories and department stores the lamp or bulb is often removed by the employees, resulting in the loss of the lamps and often in the loss of light in parts of the building where it is needed at all times.

I am well aware that it is not broadly new to provide devices for this purpose, but I am not aware of any devices being used which provides a device that is adapted for use in a lamp socket of ordinary and well known makes and which will permit my device being readily installed therein.

Broadly considered, the invention comprises a pin device that is formed with a sharp inner end that is adapted to enter the soft thin metal shell at the inner end of the lamp when the pin is turned down toward the end of the lamp and thereby preventing the lamps being removed until the pin is turned backward or out of the hole made, by the sharp point of the pin.

Suitable means is provided for operating the pin to prevent unauthorized persons from interfering with the attachment.

Referring to the drawings: 4

Figure 1 is a plan view of the upper end of an incandescent lamp socket with the bonnet or inclosing portion removed, and showing the lamp locking device.

Fig. 2 is a vertical sectional view on the line 22 of Fig. 1, showing the locking pin with its lower end embedded in the thin metal at the inner or threaded end of the lamp.

Fig. 3 is a perspective view of the key for operating the pin.

Fig. 4: is a detail view of the device removed from the socket fixture.

Referring to the drawings in detail:

1 and 2 designate the two parts of the insulating portion of the socket, 3 and 4 the registering openings through which the securing means pass, as the small bolts 5; the lower threaded ends of these bolts enter the threaded openings in the current conducting plate 6 which, as shown, is a part of the threaded shell. In order to install the locking device shown in Fig. 4 one of the bolts 5 are removed and the device shown in Fig. 4 substituted therefor. This device comprises a tubular member 7 having a thread 8 at its lower end to engage the threaded opening in the inwardly bent part of the metallic shell, as shown in Fig. 2; a pin 9 passing through the member 7, and an enlarged threaded portion 10 at its upper end which engages the internally threaded portion 11 of the tubular member 7. The upper end of the pin 9 is formed with a triangular shaped part 12 which receives the triangular shaped slot 13 in the end of the key 14. It is of course understood that the shape or configuration of the end 12 and slot 13 may be changed as desired.

It is. also to be understood that the structure shown in Fig. 4 may be varied to fit the bolt-receiving openings of other makes of sockets, the object being to provide a look,- ing device that will prevent the removal of the lamp.

In operation the bolt 5 is removed and the tubular member 7 inserted in its place, the threads 8 engaging the threaded opening in the plate 6. The pin 9 with its sharpened end 9 is turned downward until the sharp end embeds itself into the soft metal part 15 of the lamp 16. The thread 10 serving to retain the pin in place and prevent the removal of the lamp. When it is necessary to remove the lamp the key 14 is used to turn the pin backward.

What I claim is:

1. A lamp socket having a base-portion formed with an opening therethrough, one end of which is enlarged to form a shouL dered part, a tubular member in the opening and formed with an enlarged internally threaded part to engage the shouldered part of the opening, the other end of the tubular member being externally threaded, a pin having an enlarged threaded part to engage the internal threads of the tubular member, and a smaller part extending through the tubular member and having a sharpened end for engaging the end of an incandescent lamp for locking the same in the socket, as described.

2. A device for the purpose described, comprising a tubular member, one end of which is formed with an enlarged internally threaded part and its other end being externally threaded, a pin in said member and having an enlarged externally threaded part for engaging the internal threads of the tubular member, the outer end of the pin being pointed.

3. A lamp securing device comprisin a tubular member internally threaded at its upper end and externally threaded at its opposite lower end, a pin in saidmember and having a threaded portion engaging the internally threaded portion of said member, the upper end of the pin having a projection to receive a socket key for threading the pin into the tubular member and for forcing the pin into the metal at the inner end of the lamp when in place in the socket,

as described.

LEON M. TOPOOSIAN. 

